import sys
readline = sys.stdin.readline
from collections import deque

def f(G, s, N):
    Q = deque([])
    dist = [-1] * N
    par = [-1] * N
    dist[s] = 0
    for u, c in G[s]:
        par[u] = s
        dist[u] = c
        Q.append(u)

    while Q:
        u = Q.popleft()
        for v, c in G[u]:
            if dist[v] != -1:
                continue
            dist[v] = dist[u] + c
            par[v] = u
            Q.append(v)
            
    return dist, par

def doubling(X):
    M = 35
    dp = [[0] * len(X) for i in range(M)]
    dp[0] = X
    for i in range(M - 1):
        for j in range(len(X)):
            dp[i + 1][j] = dp[i][dp[i][j]]
    return dp
        


N = int(readline())
G = [[] for i in range(N)]
for i in range(N - 1):
    a, b, c = map(int, readline().split())
    a, b = a - 1 ,b - 1
    G[a].append((b, c))
    G[b].append((a, c))
    
D, P = f(G, 0, N)
dp = doubling(P)

Q = int(readline())
for _ in range(Q):
    s, t = map(int, readline().split())
    s, t = s - 1, t - 1
    ps, pt = s, t
    if D[s] > D[t]:
        s, t = t, s
    d = D[t] - D[s]
    for i in range(30):
        if (d >> i) & 1:
            t = dp[i][t]
    if s == t:
        LCA = 0
    else:
        for i in range(30, -1, -1):
            if dp[i][s] != dp[i][t]:
                s = dp[i][s]
                t = dp[i][t]
        LCA = P[s]
    print(D[ps] + D[pt] - 2 * D[LCA])